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Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355M vs S355J2 EN 10025-4 Strength Comparison Steel Plates
Gangsteel is the professional supplier you can trust for both S355M (EN 10025-4 TMCP) and S355J2 (EN 10025-2 hot rolled) plates, with the largest combined stock in Asia – over 8,000 tons ready for immediate delivery in thickness 6–200 mm, width 1500–4200 mm, length up to 18 m. All plates are produced by top mills (HBIS, Shougang) with full European approvals and third-party inspection (DNV, ABS, LR, BV, CCS, KR, TÜV, SGS).
We supply both grades with Z35 through-thickness quality in stock, 100 % UT EN 10160 S2/E2 standard, and full documentation.
Explore our complete en 10025 4 High Strength Structural Steel series for all grades.
S355M (EN 10025-4 TMCP) and S355J2 (EN 10025-2 hot rolled) are the two most commonly compared grades when engineers look for 355 MPa yield strength steel. Both have identical nominal yield and tensile strength, but differ significantly in delivery condition, low-temperature toughness, weldability, and overall performance in demanding applications.
|
Property |
S355J2 (EN 10025-2) |
S355M (EN 10025-4 TMCP) |
Winner & Reason |
|---|---|---|---|
|
Delivery Condition |
Hot rolled (as-rolled or normalized rolled possible) |
Thermomechanical rolled (TMCP) |
S355M – lower residual stress, better flatness |
|
Minimum Yield Strength ReH (MPa) |
355 (≤16 mm) → 275 (>100 mm) |
355 (≤16 mm) → 295–305 (>100 mm) |
S355M – much better thick plate strength |
|
Tensile Strength Rm (MPa) |
470–630 (all thicknesses) |
470–630 (≤100 mm) → 450–610 (>100 mm) |
Tie – same range |
|
Elongation A5 min (%) |
22 |
22 |
Tie |
|
Impact Toughness (long.) |
≥27 J at –20 °C |
≥40 J at –20 °C |
S355M – higher guaranteed energy |
|
CEV max |
0.45–0.47 (depending on thickness) |
0.39 |
S355M – significantly better weldability |
|
Preheat-free Welding (mm) |
Up to 30–40 mm |
Up to 80–100 mm |
S355M – huge fabrication advantage |
|
Residual Stress |
Higher (hot rolled) |
Very low (TMCP) |
S355M – less distortion, better fatigue |
|
Through-Thickness (Z35) |
Possible but more difficult |
Excellent (standard in thick plates) |
S355M |
|
Fatigue Life |
Good |
20-30 % better (finer grain, lower stress) |
S355M |
|
Price (November 2025) |
Baseline |
+80–140 USD/ton |
S355J2 cheaper, S355M better value |
|
Market Share (Offshore Wind) |
<10 % |
>90 % |
S355M dominates |
Bottom line: If your project temperature is above –20 °C and budget is tight → S355J2 is acceptable. If you need better thick-plate strength, better weldability without preheat, or longer fatigue life → S355M is the clear winner and has become the default choice in 90 % of new offshore wind and cold-region projects.
|
Element |
S355J2 (EN 10025-2) max % |
S355M (EN 10025-4) max % |
Difference & Impact |
|---|---|---|---|
|
C |
0.20 |
0.14 |
Lower C in S355M = much better weldability & HAZ toughness |
|
Si |
0.55 |
0.50 |
Similar |
|
Mn |
1.60 |
1.60 |
Same |
|
P |
0.025 |
0.025 |
Same |
|
S |
0.025 |
0.020 |
Slightly lower in S355M |
|
Nb + V + Ti |
0.17 (combined) |
0.20 (combined) |
Higher microalloying in S355M for finer grain |
|
CEV max |
0.45 (t≤150 mm) |
0.39 (all thicknesses) |
S355M CEV 15-20 % lower → dramatically better weldability |
The lower CEV and higher microalloying in S355M are what give it the superior properties despite identical nominal strength.
Full chemical data: S355M Chemical Composition EN 10025-4 Supplier
|
Thickness (mm) |
S355J2 ReH min (MPa) |
S355M ReH min (MPa) |
Difference |
|---|---|---|---|
|
≤16 |
355 |
355 |
Same |
|
>16 ≤40 |
345 |
345 |
Same |
|
>40 ≤63 |
335 |
335 |
Same |
|
>63 ≤100 |
315 |
315 |
Same |
|
>100 ≤150 |
295 |
295–305 |
S355M stronger |
|
>150 ≤200 |
275–285 |
285–295 |
S355M significantly stronger |
In thick plates (>100 mm), S355M maintains much higher yield strength thanks to TMCP.
Full mechanical data: S355M Mechanical Properties EN 10025-4 Plate Supplier
Q1: What is the main difference between S355M and S355J2?
A: S355M is TMCP fine-grain steel with much better thick-plate strength, lower CEV (better weldability), and superior HAZ toughness. S355J2 is traditional hot rolled steel with higher CEV and lower performance in thick sections.
Q2: Can I replace S355J2 with S355M?
A: Yes – S355M is a direct upgrade with better properties at a moderate price increase. Most engineers now specify S355M as standard for new designs.
Q3: What is the price difference today?
A: S355M is approximately 80–140 USD/ton higher than S355J2 (November 2025 market), but the weight saving and fabrication advantages usually make it cheaper overall.
Q4: Which one has better weldability?
A: S355M – lower CEV and TMCP process give superior HAZ toughness and allow welding without preheating up to 80–100 mm thickness.
Q5: Which is better for offshore wind towers?
A: S355M is now the industry standard for offshore wind (used in 90 % of new projects) due to better thick-plate strength and fatigue performance.
Q6: Do you have both grades in stock?
A: Yes – very large stock of both S355J2 and S355M in all common thicknesses, ready for immediate delivery.
Q7: Can you supply dual-certified plates?
A: Yes – many of our plates are dual-certified EN 10025-2 S355J2 and EN 10025-4 S355M when the properties meet both standards.
Need S355M or S355J2 plates? Contact us for quotation within 2 hours.
Email: admin@gangsteel.com WhatsApp/WeChat/Mobile: +86 135 9887 9167 Website: https://gangsteel.net/
Gangsteel – Your Expert for Both S355J2 and S355M Plates.
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